In a famous novel, –Madame” has some books to change (6)

I believe the answer is:

bovary

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'in' is the definition.
Both the answer and definition are adjectives.
Maybe there's an association between them I don't understand?

'a famous novel madame has some books to change' is the wordplay.
'a famous novel madame has' becomes 'b' (I can't explain this - if you can you should give a lot more credence to this answer).
'some' indicates the central letters.
'to change' becomes 'vary' (synonyms).
The central letter of 'books' is 'o'.
'b'+'o'+'vary'='BOVARY'

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I've seen this clue in the Evening Standard.

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